T. BOONKERD, S. CHANTANAORRAPINT, and W. KHWAIPHAN, “Pteridophyte Diversity in the Tropical Lowland Rainforest of Khao Nan National Park, Nakhon Si Thammarat Province, Thailand”, Trop. Nat. His., vol. 8, no. 2, pp. 83–97, Oct. 2008.